Materials Literature
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The reactivity of oxygen adatoms formed by dissociative adsorption of O 2 on Cu(100) at 100 K for CO oxidation and hydrogen abstraction from water was investigated by means of HREELS and TPD in comparison with the reactivity of adsorbed oxygen in thermally stable phases. The oxygen adatoms formed on the Cu(100) surfac…
Other| June 01, 1997 Octahedral versus tetrahedral coordination of Al in synthetic micas determined by XANES Annibale Mottana; Annibale Mottana Universita di Roma Tre, Dipartimento di Scienze Geologiche, Rome, Italy Search for other works by this author on: GSW Google Scholar Jean-Louis Robert; Jean-Louis Robert Searc…
Most methods of crystal structure prediction generate many trial structures. Because these may differ in choice of unit cell, it is not always immediately obvious whether or not two such structures are equivalent. A method to answer this question is described for the case where the asymmetric unit contains one molecul…
A detection system made with a silicon drift detector cooled by a Peltier element has been designed and tested. This system has been conceived to be implemented in electron probe microanalyzers for the x-ray microanalysis of the specimen. The good energy resolution of the detector, 155 eV full width at half-maximum at…
Operation of the planar-flow melt-spinning process in a regime where the wheelspeed is high relative to the (average) solidification rate is studied. A distinct solidification front occurs. An analysis based on the governing energy and momentum equations shows that heat transfer and solidification are only weakly coup…
Two new mesogenic series have been synthesized. They have the same main core which contains four aromatic rings, with two lateral substituents on the same side of one of the inner rings. One of the substituents is a 4-chlorobenzyloxy group and the second is an alkoxy chain. The positions of the lateral substituents ar…
Effective atomic numbers for total and dominant partial interaction processes of photons (1-50 MeV), electrons (1-50 MeV), and protons (1-200 MeV) for the composite materials bone (cortical), muscle (striated), water, polystyrene, Perspex, and Nylon-6 are derived. For photons, the effective atomic number from pair pro…
Atomic force microscopy (AFM) was used to investigate the surface structure and photo-induced surface morphological changes in azobenzene crystals. In large-scale images, a layered structure was observed. The thickness of the layer was 1.8±0.2 nm, corresponding to bilayers of azobenzene molecules. Molecular resolution…
In an effort to study sequence ordering during annealing in semicrystalline copolyesters, the carbonyl carbon of p -hydroxybenzoic acid was 13 C tagged and then solution polymerized with 2-hydroxy-6-naphthoic acid to form a low molecular weight, 50/50, random copolyester. The random copolyester was annealed at 40 deg…
The heat capacity changes (Δ C p ) at the glass transition in mixed‐alkali tellurite glasses of (20‐ x )Li 2 O‐ x Na 2 O‐ 80 TeO 2 that show different fragilities, depending on the Na 2 O/Li 2 O ratio, have been measured to obtain more‐detailed information on the structure of tellurite glasses or supercooled liquids w…
Langmuir films of poly( o -anisidine) conducting polymer in its undoped (emeraldine base) and doped (emeraldine salt) forms have been obtained by the proper selection of subphase. π/ A isotherms, quartz crystal microbalance, Brewster angle microscopic, and UV−vis−near IR spectroscopic measurements provided evidence co…
We have isolated the gene encoding L-allo-threonine aldolase (L-allo-TA) from Aeromonas jandaei DK-39, a pyridoxal 5'-phosphate (PLP)-dependent enzyme that stereospecifically catalyzes the interconversion of L-allo-threonine and glycine. The gene contains an open reading frame consisting of 1,014 nucleotides correspon…
ABSTRACT Fracture properties of short‐dough biscuits were determined in three‐point bending tests. Biscuits exhibited an essentially elastic behaviour and fractured at small strain. Span length did not influence the parameters measured, in accordance with theory. Biscuits fractured with the bottom side upwards had sli…
Other| June 01, 1997 Solid solution in the celadonite family; the new minerals ferrosceladonite, K2Fe2+2Fe3+2Si8O20(OH)4, and ferroaluminoceladonite, K2Fe2+2Al2 Si8 O20 (OH)4 Gejing Li; Gejing Li University of Michigan, Department of Geolgoical Sciences, Ann Arbor, MI, United States Search for other works by this auth…
The influence of crystal volume fraction on fracture toughness ( K I C ) and indentation strength was analyzed for Li 2 O‐Al 2 O 3 ‐CaO‐SiO 2 (LACS) and LACS glass‐ceramics containing 0.58 mmol% AgNO 3 (LACS‐0.58Ag) or 0.78 mmol% AgNO 3 (LACS‐0.78Ag). The mean flexure strength, indentation strength, and K I C values o…
The kinetics of thermal imidization of a poly(ester amic acid) in solid state was investigated in the temperature range 120−180 °C. FT-Raman spectroscopy was used for the measurement of imidization. Data on changes in intensity were collected on compressed thin specimens that had been isothermally cured. FT-Raman spec…
Effect of irradiation on blood-cerebrospinal fluid (CSF) barrier (BCB) was studied quantitatively by observing the effect of methotrexate (MTX) permeation into the CSF before, during, and after brain irradiation after i.v. injection of MTX. Observation of 15 brain tumor patients indicated that in large brain tumors, t…
Surface modifications of emeraldine base (EB) films have been carried out via thermally induced graft copolymerization with acrylic acid (AAc), sodium salt of styrenesulfonic acid (NaSS), N, N‘ -dimethyl(methacryloylethyl)ammonium propanesulfonate (DMAPS), and acrylamide (AAm). The structure and chemical composition o…
Abstract Novel biodegradable regular poly(ester urethane)s 2 (η red ≤ 0,62 dL/g) were synthesized for the first time by polycondensation of di‐ p ‐toluenesulfonic acid salts of bis(phenylalanine) α,ω‐alkylene diesters 1 with di‐ p ‐nitrophenyl trimethylenedicarbonate (4) under mild conditions in organic solvents in th…
Silica–polyimide hybrid composites were prepared via a sol–gel process and thermal imidization. Two different types of soluble precursors, poly(amic acid) (PAA) and poly(amic diethyl ester) (ES), chemically convertible to poly(p-phenylene biphenyltetracarboximide), were used as organic polymer matrix component, and te…